Specific Features of Emulsification of Epoxy Resins
in Aqueous Solutions of Nonionic Surfactants
E. V. Shinkareva and V. D. Koshevar
Institute of General and Inorganic Chemistry, National Academy of Sciences of Belarus, Minsk, Belarus
Received June 3, 2010
Abstract—The conditions of emulsification of imported analogs of Russian epoxy resins in the presence of
nonionic surfactants were studied. The curing kinetics and the hardness of coatings formed from compounds
containing epoxy emulsions and ЕPILINK 701 and Waterpoxy 751 curing agents were examined.
AND POLYMERIC MATERIALS
ISSN 1070-4272, Russian Journal of Applied Chemistry, 2011, Vol. 84, No. 3, pp. 479–485. © Pleiades Publishing, Ltd., 2011.
Original Russian Text © E.V. Shinkareva, V.D. Koshevar, 2011, published in Zhurnal Prikladnoi Khimii, 2011, Vol. 84, No. 3, pp. 488–494.
Among the diversity of epoxy resins (ERs) and
compounds, 4,4'-isopropylidenediphenol (Dian) ERs
account for up to 90% of the total production volume.
These resins are important film-forming substances for
paint-and-varnish materials (PVMs) used in corrosion
protection. They exhibit a set of unique properties:
high adhesion of epoxy coatings to the majority of
structural materials, good physicomechanical pro-
perties, minimal shrinkage in the course of curing, and
resistance to hydrolysis due to the absence of readily
saponifiable groups in their molecules. In addition,
liquid epoxy Dian resins are the least toxic among
epoxy compounds, and solid Dian resins are practically
nontoxic. Russian plants produce a number of grades
of epoxy–Dian resins according to GOST (State
Standard) 10587–84. They can be subdivided into
three groups: liquid (ED-24, ED-22, ED-20, ED-20S),
low-melting (ED-16, ED-16S, ED-14, E-40), and high-
melting (ED-13, ED-10, ED-8, E-41, E-49). It should
be noted that their production considerably declined
during recent years. The assortment of ERs produced
today beyond Russia became considerably wider than
in Russia, and the demand for these resins grows year
by year .
Epoxy resins can be used in formulations of the
most promising environmentally sound PVMs: free of
volatile solvents, water-thinnable, and powdered .
Growing attention has been given recently to studies
and development of procedures for preparing film-
forming systems by ER emulsification [2, 3]. Aqueous
emulsions (AEs) of ERs have such advantages as the
absence of organic solvents, environmental safety,
nontoxicity, fire and explosion safety, thinnability with
water, and high adhesion to wet substrates; their use
involves no problems with the subsequent cleanup of
the equipment (cleanup with water and aqueous
detergents). The coatings formed from ER AEs are
resistant to chemicals, weakly absorb contaminants,
exhibit high adhesion to various types of supports, and
are resistant to weather factors.
Today it is technically feasible to produce AEs
based on ERs produced in Russia: ED-20, E-40, E-41,
and ED-8 [3, 4]. In particular, an emulsion of ED-20
resin can be prepared by emulsification of the ER in
the presence of a nonionic surfactant, alkyl
polyethylene glycol ether with 28 mol of ethylene
oxide (LCN-287) , and emulsions of ED-20, E-40,
E-41, and ED-8 resins, in the presence of an
ethoxylated fatty alcohol (Disponil 23, Henkel) .
In this study we examined the conditions for
emulsification of imported analogs of Russian ERs in
the presence of nonionic surfactants and the curing
kinetics and hardness of coatings based on the
emulsions prepared and on ЕPILINK 701 and
Waterpoxy 751 curing agents.
The type of the emulsions prepared was determined
from their specific conductivity. The resistance R of
the emulsions was measured with an R 5058 ac bridge